Why are lonely, young men a growing threat to our safety? In 2018, a Toronto man drove a van down a busy sidewalk, killing 11 people and injuring many more. He was linked to the "incel" movement, a dark online world fueled by violent misogyny, extreme isolation and perceived rejection.

In the wake of the attack, Evan Mead discovers a disturbing connection to the perpetrator. They were former high school classmates; both outcasts, existing together on the fringes of social acceptance.

How did two young men who started in similar circumstances, end up on such drastically different paths?

This five-part series examines how socially-isolated young men can vanish into an online world of nihilism and despair that radicalizes them into angry — potentially deadly — misogynists. Hosted by Ellen Chloë Bateman and produced by Daemon Fairless (Hunting Warhead). New episodes every Tuesday.